Results 1 to 7 of 7

Math Help - Angles at a point

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    6

    Angles at a point

    Hi all, im a new member and a high shcool Algerbra student. Im having quite a bit of trouble with this homework(which is being graded as a quiz ) To start, i dont under stand what some of the questions are asking me, for example the first one is(this is in the intergrated algerbra AMSCO text book pgs 294-295 if any of you happent to have it ) the first question is if line AB and line CD intersect at E, Angle AEC=2=x+10 and angle DEB=2x-30, find angle AEC I have no idea how to even set this up, my own notes dont even explain it. I would be very apreceative if anyone could help
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Thor View Post
    Hi all, im a new member and a high shcool Algerbra student. Im having quite a bit of trouble with this homework(which is being graded as a quiz ) To start, i dont under stand what some of the questions are asking me, for example the first one is(this is in the intergrated algerbra AMSCO text book pgs 294-295 if any of you happent to have it ) the first question is if line AB and line CD intersect at E, Angle AEC=2=x+10 and angle DEB=2x-30, find angle AEC I have no idea how to even set this up, my own notes dont even explain it. I would be very apreceative if anyone could help
    did you draw a diagram?

    recall that angles at a point sum to 360 degrees. so,

    AED + DEB + BEC + AEC = 360

    as this will be graded as a quiz, that's all the help you'll get. you finish up the rest
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2010
    Posts
    6
    Im sorry, but i didnt quite understand what you ment, do you mean i have to set it up like a let statment type problem? As for the diagram, i drew one up in MS pain Angles at a point-untitled.jpg
    Follow Math Help Forum on Facebook and Google+

  4. #4
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Thor View Post
    Im sorry, but i didnt quite understand what you ment, do you mean i have to set it up like a let statment type problem? As for the diagram, i drew one up in MS pain Click image for larger version. 

Name:	Untitled.jpg 
Views:	16 
Size:	8.6 KB 
ID:	15297
    Hmm, I have no idea how you got that diagram. the line CD doesn't even intersect AB and you have three extra points G, H and F. clearly it can't be right.

    the correct diagram is below.
    Attached Thumbnails Attached Thumbnails Angles at a point-angles-point.png  
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2010
    Posts
    6
    OH! *facepalm* I was using a diagram the text book page had given me that looks similart to what i thought it would look like....Sorry, but i think i got it figured out.

    I think its x+10+2x-30=360
    3x-20=360
    3x=380
    x=126.6....

    But the check for it comes out to be 359.8, but then again i suck at math....so this is wrong correct?
    Follow Math Help Forum on Facebook and Google+

  6. #6
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Thor View Post
    OH! *facepalm* I was using a diagram the text book page had given me that looks similart to what i thought it would look like....Sorry, but i think i got it figured out.

    I think its x+10+2x-30=360
    3x-20=360
    3x=380
    x=126.6....

    But the check for it comes out to be 359.8, but then again i suck at math....so this is wrong correct?
    i wouldn't use decimals. leave your answers in terms of fractions and you will get the exact answer.

    anyway, note that my equation has four angles in it. yours has two.

    Final Hint: see number 10 here

    that will give you the right equation to solve for x. note that "x" is NOT what you are looking for. you use it to find your answer.
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Feb 2010
    Posts
    6
    OH!!!!! Now i think i get it... Much thanks man!

    EDIT: I think i did somthing wrong though....
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. principle angles and related acute angles
    Posted in the Trigonometry Forum
    Replies: 4
    Last Post: December 19th 2011, 07:40 AM
  2. sum of interior angles of a 7-point star.
    Posted in the Geometry Forum
    Replies: 7
    Last Post: April 4th 2011, 10:41 PM
  3. Find point with two angles
    Posted in the Trigonometry Forum
    Replies: 11
    Last Post: February 14th 2011, 12:23 AM
  4. Compound Angles or Double Angles?
    Posted in the Trigonometry Forum
    Replies: 8
    Last Post: July 25th 2010, 10:05 AM
  5. Replies: 1
    Last Post: January 7th 2009, 07:07 PM

Search Tags


/mathhelpforum @mathhelpforum